Method of inspecting magnetic recording medium, and method of controlling movement of magnetic head in magnetic recording/reproducing apparatus by utilizing inspecting method

摘要

A method for moving magnetic heads in a magnetic recording/reproducing apparatus, which comprises the steps of writing high-frequency signals in the magnetic recording/reproducing tracks; and then, either (i) conducting DC erasing or AC erasing to inspect extra pulse signals reproduced from the erased tracks, or (ii) inspecting concurrently occurring signals of missing pulse and spike pulse, which are reproduced from the written signals, whereby minute protrusions on a surface of the tracks were detected. Reading and writing of information are conducted while the magnetic heads are moved in a manner controlled so that reading and writing of information in specific tracks having defects is avoided. This method enhances reliability and life of the magnetic recording/reproducing apparatus.

主权项

1. An improvement in a method for inspecting a magnetic recording medium wherein prescribed signals recorded in a disk-shaped magnetic recording medium are reproduced by using magnetic heads while the disk-shaped magnetic recording medium is rotated, and the magnetic recording medium is inspected on the basis of the reproduced signals;
said improvement comprising writing high-frequency signals in magnetic recording/reproducing tracks, and then, either (i) conducting DC erasing or AC erasing to inspect extra pulse signals reproduced from the erased tracks, or (ii) inspecting concurrently occurring signals of missing pulse and spike pulse, which are reproduced from the written signals, whereby defects of the tracks are detected.